fixes issue #3016 by adding % info for file name and removes extra be (#3092)

* fixes issue #3016 by adding % info for file name and removes extra be

* added missing parenthesis and corrected either typo.

Author: connorlewis

R/save.r

@@ -5,9 +5,17 @@
 #' graphics device. It also guesses the type of graphics device from the
 #' extension.
 #'
+#' Note: Filenames with page numbers can be generated by including a C
+#' integer format expression, such as `%03d` (as in the default file name
+#' for most R graphics devices, see e.g. [png()]).
+#' Thus, `filename = "figure%03d.png"` will produce successive filenames
+#' `figure001.png`, `figure002.png`, `figure003.png`, etc. To write a filename
+#' containing the `%` sign, use `%%`. For example, `filename = "figure-100%%.png"`
+#' will produce the filename `figure-100%.png`.
+#'
 #' @param filename File name to create on disk.
 #' @param plot Plot to save, defaults to last plot displayed.
-#' @param device Device to use. Can be either be a device function
+#' @param device Device to use. Can either be a device function
 #'   (e.g. [png()]), or one of "eps", "ps", "tex" (pictex),
 #'   "pdf", "jpeg", "tiff", "png", "bmp", "svg" or "wmf" (windows only).
 #' @param path Path to save plot to (combined with filename).